Ampulla of VaterCommon Bile Duct NeoplasmsCarcinomaPancreaticoduodenectomyCarcinoma, Squamous CellCarcinoma, HepatocellularFallopian TubesDuodenal NeoplasmsDuodenoscopyCarcinoma, Signet Ring CellAdenocarcinomaCarcinoma in SituCarcinoma, NeuroendocrineCarcinoma, PapillaryCholangiopancreatography, Endoscopic RetrogradeBile Duct NeoplasmsImmunohistochemistryCommon Bile Duct DiseasesNeoplasms, Multiple PrimaryDuodenoscopesBiliary Tract NeoplasmsJaundiceLiver NeoplasmsAnus, ImperforateCarcinoma, Ductal, BreastAdenoma, VillousDuodenumCarcinoma, Basal CellSperm TransportPancreatic DuctsCarcinoid TumorKeratin-7Carcinoma, Large CellKrukenberg TumorGallstonesTumor Markers, BiologicalPancreatic NeoplasmsCommon Bile DuctPrognosisDuodenal DiseasesNeoplasm StagingOvum TransportCarcinoma, Transitional CellBiliary Tract Surgical ProceduresCarcinoma, BronchogenicCarcinoma, Intraductal, NoninfiltratingCarcinoma, Adenoid CysticNeoplasm InvasivenessHair Cells, AmpullaKeratin-20Carcinoma, Small CellCarcinoma, MedullaryCarcinoma, LobularGallbladder NeoplasmsEndolymphRetrospective StudiesSemicircular CanalsNasopharyngeal Neoplasms